package Catmandu::Fix::substring;
use Catmandu::Sane;
use Catmandu::Util qw(:is :data);
use Moo;
has path => (is => 'ro', required => 1);
has key => (is => 'ro', required => 1);
has args => (is => 'ro', required => 1);
around BUILDARGS => sub {
my ($orig, $class, $path, @args) = @_;
my ($p, $key) = parse_data_path($path);
$orig->($class, path => $p, key => $key, args => [@args]);
};
sub fix {
my ($self, $data) = @_;
my $key = $self->key;
my $args = $self->args;
for my $match (grep ref, data_at($self->path, $data)) {
set_data($match, $key,
map { is_string($_) ? mysubstr($_, @$args) : $_ }
get_data($match, $key));
}
$data;
}
sub mysubstr {
if (@_ == 2) { substr($_[0], $_[1]) }
elsif (@_ == 3) { substr($_[0], $_[1], $_[2]) }
elsif (@_ == 4) { substr($_[0], $_[1], $_[2], $_[3]) }
else { confess "wrong number of arguments" }
}
=head1 NAME
Catmandu::Fix::substring - extract a substring out of the value of a field
=head1 SYNOPSIS
# Extract a substring out of the value of a field
substring('initials',0,1);
=head1 SEE ALSO
L<Catmandu::Fix>, substr
=cut
1;